Which of the following produces the secondary tissues of trees?
a. Sapwood
b. Cork
c. Vascular cambium
d. Heartwood
e. Cortex
Ans: c. Vascular cambium
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A tubal ligation consists of cutting and sealing the vas deferens so that sperm are unable to reach the seminal fluid.
Answer the following statement true (T) or false (F)
Recent data indicate what regarding forests in eastern North America?
A) a steady increase in forest since the late 1800s B) no change over the past 200 years C) no change in the past 50 years D) a decline in forested area in the past 50 years
Which of the following is a non-protein carrier found in some electron transport chains?
A) flavoproteins B) metal-containing proteins C) ribozymes D) cytochromes E) ubiquinones
One difference between DNA and RNA is that __________.
A. DNA is single-stranded, whereas RNA is double-stranded. B. DNA uses ribose, whereas RNA uses deoxyribose. C. DNA uses the bases CGAT, whereas RNA uses the bases CGAU. D. DNA is a nucleic acid, and RNA is a protein.